Gema María López Camino

That is not true. Matrix values express the amount of nutrients the manufacturer of an enzyme product believes the product can release. All enzymes are substrate specific, so the matrix value will be wrong if you add an enzyme in a diet with no substrate for that enzyme.

Matrix values describes the amount of additional nutrients that are released when you add the enzyme. If you study the matrix values for a phytase product you will notice that the manufacturer claims that his product releases xx g of dig. P per kg. feed or is equivalent to adding xx g of DCP/MCP to the feed. If you are studying the matrix values for carbohydrases you will typically notice that the ...

Hello there. Mick´s comments are, to me, absolutely correct! Phytases do have an effect in making tot Ca of the diet more available to the bird. But to reflect this effect correctly without making mistakes in what real Ca can be measured in your feed, then use 2 Ca values for each ingredient: Ca analytical - I call it Ca label - and tot Ca (biological by Mick). However, for the phytase, just ...

Hello Rami. You do need to take account of the Ca release from the phytase. You have 2 options. The first is to duplicate your Ca values on all raw materials and re-name this Ca analytical - no value on phytase. You use this for QC. Call the duplicate Ca biological and in this case, include the Ca release value on the phytase. Ca biological you use so set the animal requirements; Ca analytical has ...